Foldable playyard

ABSTRACT

A foldable playyard includes a first surrounding frame, a second surrounding frame, a boundary shelter including a plurality of boundary walls mounted between the first and second surrounding frames to define a playyard cavity within the boundary walls, and a supporting frame, which is surrounded by the boundary shelter, including a plurality of supporting arms, in such a manner that each of the supporting arms is capable of moving between a folded position and an unfolded position. In the folded position, the first surrounding frame is adapted to fold towards the second surrounding frame so as to minimize a depth of the playyard cavity, and in the unfolded position, each of the supporting arms is arranged to substantially support between the first and second surrounding frames and to tensely stretch the boundary shelter, so as to form a tension surface on each of the boundary walls.

BACKGROUND OF THE PRESENT INVENTION

[0001] 1. Field of Invention

[0002] The present invention relates to a playyard, and more particularly to a foldable playyard, which has a rigid, simple, and strong structure that can be quickly and easily folded for carriage and storage and unfolded for accommodating a baby or young child therein.

[0003] 2. Description of Related Arts

[0004] Playyard is used to restrict the movement of a baby or a young child who is able to trail or walk when the parents cannot always keep their eyes on their babies. In order to save space for travel and storage, most of the playyards have a foldable design to reduce its sizes.

[0005] A conventional playyard comprises a foldable frame having a plurality of supporting posts connected together by means of folding joints to form an open box structure for supporting a cloth boundary such that a baby or a young child can dispose therewithin. However, uncountable complains report that babies are likely to be hurt due to the unwanted folding up of the playyards accidentally.

[0006] Moreover, any structure that can be folded would not has a rigid structure due to the clearance existing in those folding joints, so that the conventional foldable playyard has another adverse effect of rocking and shaking. In other words, the conventional foldable playyard fails to provide an absolutely safe environment for the babies.

[0007] Since the conventional foldable playyard contains too many joints, it not only unreasonably increases the manufacturing cost thereof but also provides construction weakness at those joints. Most foldable playyards break at such weakened joint structure that makes the products being not durable enough.

[0008] It is unreasonable to place your babies in a risky or unsafe situation. However, we have to tolerate the above mentioned suffering drawbacks until an improved innovative playyard structure, that can provide an absolutely safe boundary for the babies and still can reduce its size when it is not used to save the travel or storage space, is developed.

SUMMARY OF THE PRESENT INVENTION

[0009] A main object of the present invention is to provide a foldable playyard which can be quickly folded up into a compact unit when it is not used to save the travel or storage space and unfolded for use.

[0010] Another object of the present invention is to provide a foldable playyard which not only can provide a rigid structure to prevent the playyard from being shaken and rocked but also can tensely support the fabric made boundary shelter, so as to reinforce the rigid frame structure to avoid any unwanted collapse.

[0011] Another object of the present invention is to provide a foldable playyard that is easy to set up and collapse within a relatively short time.

[0012] Another object of the present invention is to provide a foldable playyard, which has a simple construction that every individual is able to fold and unfold the playyard.

[0013] Another object of the present invention is to provide a foldable playyard that can be used in any location without using tools for assembly or disassembly.

[0014] Another object of the present invention is to provide a foldable playyard, wherein no expensive or complicate structure is required to employ in the present invention in order to achieve the above mentioned objects. Therefore, the present invention successfully provides an economic and efficient solution for providing rigid configuration for the playyard.

[0015] Accordingly, in order to accomplish the above objects, the present invention provides a foldable playyard, comprising:

[0016] a first surrounding frame;

[0017] a second surrounding frame spaced apart from the first surrounding frame in a vertical direction;

[0018] a boundary shelter comprising a bottom wall and a plurality of boundary walls upwardly extended from a circumferential edge of the bottom wall and mounted between the first and second surrounding frames to define a playyard cavity within the boundary walls and the bottom wall; and

[0019] a supporting frame, which is surrounded by the boundary shelter, comprising a plurality of supporting arms each coupling the first surrounding frame with the second surrounding frame, in such a manner that each of the supporting arms is capable of moving between a folded position and an unfolded position, wherein in the folded position, the first surrounding frame is adapted to fold towards the second surrounding frame so as to minimize a depth of the playyard cavity, and in the unfolded position, each of the supporting arms is arranged to substantially support between the first and second surrounding frames and to tensely stretch the boundary shelter, so as to form a tension surface on each of the boundary walls.

BRIEF DESCRIPTION OF THE DRAWINGS

[0020]FIG. 1 is an exploded perspective view of a foldable playyard according to a first preferred embodiment of the present invention.

[0021]FIG. 2 is a sectional view of the foldable playyard in an unfolded position according to the above first preferred embodiment of the present invention.

[0022]FIG. 3 is a partial perspective view of the foldable playyard according to the above first preferred embodiment of the present invention.

[0023]FIG. 4 is a perspective view of the foldable playyard in a folded position according to the above first preferred embodiment of the present invention.

[0024]FIG. 5 illustrates an alternative mode of first and second surrounding frames of the foldable playyard according to the above first preferred embodiment of the present invention.

[0025]FIG. 6 is a perspective view of a foldable playyard according to a second preferred embodiment of the present invention.

[0026]FIG. 7 is a sectional view of a locking unit of the foldable playyard according to the above second preferred embodiment of the present invention.

[0027]FIG. 8 is a perspective view of the foldable playyard in a folded position according to the above second preferred embodiment of the present invention.

[0028]FIG. 9 is a perspective view of a foldable playyard according to a third preferred embodiment of the present invention.

[0029]FIG. 10 is a sectional perspective view of a second coupling joint of the foldable playyard according to the above third preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0030] Referring to FIG. 1 of the drawings, a foldable playyard according to a first preferred embodiment of the present invention is illustrated. The foldable playyard comprises a first surrounding frame 10, a second surrounding frame 20 spaced apart from the first surrounding frame 10 in a vertical direction, a fabric made boundary shelter 30, and a supporting frame 40.

[0031] The boundary shelter 30 comprises a bottom wall 31 and a plurality of boundary walls 32 upwardly extended from a circumferential edge of the bottom wall 31 and mounted between the first and second surrounding frames 10, 20 to define a playyard cavity 301 within the boundary walls 32 and the bottom wall 31.

[0032] The supporting frame 40, which is surrounded by the boundary shelter 30, comprises a plurality of supporting arms 41 each coupling the first surrounding frame 10 with the second surrounding frame 20, in such a manner that each of the supporting arms 41 is capable of moving between a folded position and an unfolded position. In the folded position, the first surrounding frame 10 is adapted to fold towards the second surrounding frame 20 so as to minimize a depth of the playyard cavity 301, and in the unfolded position, each of the supporting arms 41 is arranged to substantially support between the first and second surrounding frames 10, 20 and to tensely stretch the boundary shelter 30, so as to form a tension surface on each of the boundary walls 32.

[0033] According to the first preferred embodiment, the first surrounding frame 10 comprises two pairs of first surrounding arms 11 connected ends to ends to form a rectangular boundary structure having a central opening 110 and four corners. The first surrounding frame 10 further comprises a plurality of coupling joints 12 for detachably connecting with the supporting frame 40.

[0034] The second surrounding frame 20 comprises two pairs of second surrounding arms 21 connected ends to ends to form a corresponding rectangular boundary structure having four corners. Accordingly, the first surrounding frame 10 is embodied to be a top frame of the playyard and the second surrounding frame 20 is embodied to be a bottom frame of the playyard.

[0035] The supporting frame 40 comprises four supporting arms 41 extended from four corner portions of the second surrounding frame 20 respectively wherein each of the supporting arms 41 has a retaining end 411 detachably connected to the respective coupling joint 12 of the first surrounding frame 10 and a folding end 412 pivotally connected to the respective second surrounding arm 21. Therefore, in the unfolded position, each of the supporting arms 41 is pivotally folded to a position that perpendicular to the second surrounding frame 20, so as to support the boundary shelter 30 by the supporting arms 41.

[0036] The boundary shelter 30, having a corresponding rectangular box shaped, is supported by the first surrounding frame 10 wherein a top edge portion of each of the boundary walls 32 is detachably attached to the respective first surrounding arm 11 of the first surrounding frame 10. The boundary shelter 30 further comprises four tubular holding flaps 33 firmly extended along four corner edges of the boundary shelter 30 in such a manner that the supporting arms 41 are slidably passing through the holding flaps 33 respectively to retain the boundary shelter 30 in position.

[0037] In order to enhance the tension of the boundary shelter 30, each boundary wall 32 has a width slightly smaller than a distance between two adjacent supporting arms 41 in such a manner that when the supporting arms 41 are folded in the unfolded position, the supporting arms 41 will tensely pull the boundary walls 32 aside to form the tension surfaces respectively, as shown in FIG. 2.

[0038] As shown in FIGS. 1 and 2, the first surrounding frame 10 comprises four coupling joints 12 provided at four corners thereof wherein each of the coupling joints 12 has a tubular sleeve 121 having an opening facing towards the second surrounding frame 20 wherein the retaining end 411 of each of the supporting arms 41 is fittedly inserted into the tubular sleeve 121 so as to detachably connect the supporting frame 40 with the first surrounding frame 10. Moreover, when the first surrounding frame 10 is mounted to the supporting frame 40, the supporting arms 41 are retained in the unfolded position, so as to lock up the supporting arms 41 in a pivotally movable manner.

[0039] In order to guide a pivotal movement of each of the supporting arms 41 with respect to the second surrounding frame 20, each of the supporting arms 41 comprises a guiding stopper 413 outwardly projected therefrom in such a manner that the guider stopper 413 is arranged to bias against the respective second surrounding arm 21 to block the further pivotal movement of the respective supporting arm 41 once the supporting arm 41 is folded perpendicularly to the second surrounding frame 20 in the unfolded position, as shown in FIG. 3.

[0040] In order to fold up the playyard of the present invention, a user is able to detach the top edge portions of the boundary walls 32 from the first surrounding arms 11 and then detach the first surrounding frame 10 from the supporting frame 40. Then, the boundary shelter 30 can be detached from the supporting frame 40 by slidably pulling out the holding flaps 33 from the supporting arms 41 respectively. Therefore, each of the supporting arms 41 is capable of pivotally folding towards the respective second 10 surrounding arm 21 of the second surrounding frame 20, so as to form a compact folded unit of the playyard, as shown in FIG. 4.

[0041]FIG. 5 illustrates an alternative mode of the first surrounding frame 10A. The first surrounding frame 10A has four locking through sleeves 13A, which are transversely provided at four corners thereof respectively, for the retaining ends 411A of the supporting arms 41A fittedly inserting thereinto and comprises four locking members 14A arranged to fittedly and coaxially insert into the retaining ends 411A of the supporting arms 41A through the locking through sleeves 13A respectively, so as to lock up the supporting arms 41A to the first supporting surrounding frame 10A respectively in a pivotally movable manner.

[0042] Accordingly, each of the supporting arms 41A is pivotally folded towards the respective second surrounding arm 21A, as shown in FIG. 5. Moreover, each of the second surrounding arms 21A has a U-shaped cross section to define a receiving cavity 211A, wherein the respective supporting arm 41A is capable of fittedly folding into the receiving cavity 211A so as to minimize a storing space of the playyard when it is folded.

[0043] It is worth to mention that the first surrounding frame 10A can be formed as the bottom frame of the playyard and the second surrounding frame 20A can be formed as the top frame of the playyard, since the top edge portions of the boundary shelter 30A is adapted to be mounted to either the first surrounding frame 10A as the top frame or the second surrounding frame 20A as the top frame without altering the folding structure of the playyard of the present invention. Furthermore, when the first surrounding frame 10A is embodied to be the bottom frame of the playyard, the locking members 14A, according to the alternative mode of the first embodiment, can function as the stand stabilizers to support the playyard on the ground.

[0044] Referring to FIG. 6, a second embodiment of the playyard illustrates an alternative mode of the first embodiment, which comprises the first and second surrounding frames 10′, 20′, the boundary shelter 30′ and the supporting frame 40′.

[0045] The first surrounding frame 10′ comprises two pairs of first surrounding arms 11′ connected ends to ends to form a rectangular boundary structure having a central opening 110′. The second surrounding frame 20′ comprises two pairs of second surrounding arms 21′ connected ends to ends to form a corresponding rectangular boundary structure.

[0046] The supporting frame 40′ comprises four supporting arms 41′ each having two ends pivotally connected to the first and second surrounding frames 10′, 20′ respectively at corners thereof. Each of the supporting arms 41′ is constructed by a pair of first and second supporting pillars 411′, 412′ pivotally connected together end to end in such a manner that each of the supporting arms 41′ is adapted for pivotally folding in half, so as to fold the first surrounding frame 10′ towards the second surrounding frame 20′ to fold up the playyard, as shown in FIG. 8. In other words, two outer ends of the first and second supporting pillars 411′, 412′ are pivotally connected to the first and second surrounding frames 10′, 20′ respectively while two inner ends of the first and second supporting frames 10′, 20′ are pivotally connected with each other.

[0047] Therefore, when the first and second supporting pillars 411′, 412′ pivotally fold outwardly, the first surrounding frame 10′ will be pull away from the second surrounding frame 20′. Since each of the boundary walls 32′ has a width slightly smaller than a distance between two supporting arms 41′, when the supporting arms 41′ are folded in the unfolded position, the supporting arms 41′ will tensely pull the boundary walls 32′ aside to form the tension surfaces respectively.

[0048] As shown in FIG. 6, each of the first and second surrounding arms 11′, 21′ of the first and second surrounding frames 10′, 20′ has a U-shaped cross section to define a receiving cavity 111′, 211′ wherein the first and second supporting pillars 411′ 412′ are capable of folding into the receiving cavities 111′, 211′ of the first and second surrounding arms 11′, 21′ respectively so as to minimize a storing space of the playyard when it is folded, as shown in FIG. 8.

[0049] As shown in FIG. 7, the supporting frame 40′ further comprises a plurality of locking units 42′ slidably mounted on the supporting arms 41′ respectively for locking up the first supporting pillar 411′ with the second supporting pillar 412′ in a pivotally movable manner. Each of the locking units 42′ comprises a tubular locker 421′ having an axial slider sleeve 422′ which has a diameter slightly larger than a diameter of the respective supporting arm 41′ for the first supporting pillar 411′ passing through wherein the slider sleeve 422′ has an inner threaded portion 423′ arranged to rotatably screw with an outer threaded portion 424′ provided on the second supporting pillar 412′ so as to securely lock up the first supporting pillar 411′ with the second supporting pillar 412′ in a pivotally movable manner.

[0050] Each of the locking units 42′ further comprises a stopper 425′, having a ring shaped, mounted on the first supporting pillar 411′ at a predetermined position that the stopper 425′ is biased against a bottom wall of the slider sleeve 422′ when the inner threaded portion 423′ of the tubular locker 421′ is rotatably engaged with the outer threaded portion 424′ of the second supporting pillar 412′.

[0051] In order to prevent an unwanted pivotal movement of the supporting frame 40′ between the first and second surrounding frames 10′, 20′, the playyard further comprises a plurality of first locker members 51′ mounted to the first surrounding frame 10′ for locking the supporting arms 41′ with the first surrounding frame 10′ in a pivotally movable manner and a plurality of second locker members 52′ mounted to the second surrounding frame 20′ for locking the supporting arms 41′ with the second surrounding frame 20′ in a pivotally movable manner.

[0052] As shown in FIG. 6, each of the first and second surrounding frames 10′, 20′ has four locking through sleeves 13′, which are transversely provided at four corners thereof respectively, wherein each of the first and second locker members 51′, 52′ is arranged to fittedly insert into two ends of the supporting arm 41′ through the locking through sleeves 13′ respectively, so as to lock up the supporting arm 41′ between the first and second surrounding frames 10′, 20′ in a pivotally movable manner. Accordingly, playyard wheels can be attached to the second locker members 52′ respectively, as shown in FIG. 6. However, the second locker members 52′ can be the stand stabilizers to support the playyard on the ground.

[0053] It is worth to mention that the structure of the playyard of the second embodiment is symmetrical such that either the first surrounding frame 10′ or the second surrounding frame 20′ can be embodied to be the top frame of the playyard depending on whether the top edge portions of the boundary shelter 30′ attached to the first surrounding frame 10′ or the second surrounding frame 20′.

[0054] Referring to FIG. 9. a third embodiment of the playyard illustrates another alternative mode of the first embodiment, wherein the second surrounding frame 20″ of the third embodiment comprises four second coupling joints 22″ for detachably connecting the surrounding frame 40″ with the second surrounding frame 20″.

[0055] Each of the second coupling joints 22″ comprises a locking member 221″, having a ring shaped, firmly attached to the folding end 412″ of the respective supporting arm 41″ and further has a guiding through slot 222″ transversely provided at four corners of the second surrounding frame 20″ for the locking member 221″ slidably mounted thereto.

[0056] Accordingly, each of the guiding through slots 221″ has an inner inserting portion 2221″ having a size slightly larger than a size of the locking member 221″ and an outer holding portion 2222″, having an upper blocking shoulder 2223″, integrally extended from the inserting portion 2221″ in such a manner the locking member 221″ is adapted to pass through the inserting portion 2221″ and slidably move to the holding portion 2222″ such that the locking member 221″ is blocked by the blocking shoulder 2223″ to lock up the respective supporting arm 41″ to the second surrounding frame 20″, as shown in FIG. 10. It is worth to mention that a downward force of a user's weight applied on the second surrounding frame 20″ will further ensure the supporting arms 41″ in the locking position since each of the locking members 221″ must be pull downwardly to move away from the holding portion 2222″ back to inserting portion 2221″ in order to detach the respective supporting arm 41″ from the second surrounding frame 20″.

[0057] It is worth to mention since each of the boundary walls 32″ has a width slightly smaller than a distance between two supporting arms 41″, when the supporting arms 41″ are pull outwardly from the inserting portion 2221″ to the holding portion 2222″, the supporting arms 41″ will tensely pull the boundary walls 32″ aside to form the tension surfaces respectively.

[0058] As shown in FIG. 9, the first surrounding frame 10″ comprises four coupling joints 12″ provided at four corners thereof wherein each of the coupling joints 12″ has a tubular sleeve 121″ having an opening facing towards the second surrounding frame 20″ wherein the retaining end 411″ of each of the supporting arms 41″ is fittedly inserted into the tubular sleeve 121″ so as to detachably connect the supporting frame 40″ with the first surrounding frame 10″. Moreover, when the first surrounding frame 10″ is mounted to the supporting frame 40″, the supporting arms 41″ are retained in the unfolded position, so as to lock up the supporting arms 41″ between the first and second surrounding frames 10″, 20″.

[0059] Alternatively, the attachment between the first surrounding frame 10″ and the supporting frame 40″ can be embodied to have the same structure, as shown in FIG. 5, such that the first surrounding frame 10″ can be detachably connected to the supporting frame 40″ to retain the supporting frame 40″ in position.

[0060] While the foregoing description and diagrams describe the first, second, and third embodiments and their alternatives, it is apparent that certain obvious modifications, variations, and substitutions may be made without departing from the spirit and scope of the present invention. For example, each of the rectangular shaped first and second surrounding frames can be modified to be a circular looped shape. 

What is claimed is:
 1. A foldable playyard, comprising: a first surrounding frame; a second surrounding frame spaced apart from said first surrounding frame in a vertical direction; a boundary shelter comprising a bottom wall and a plurality of boundary walls upwardly extended from a circumferential edge of said bottom wall and mounted between said first and second surrounding frames to define a playyard cavity within said boundary walls and said bottom wall; and a supporting frame, which is surrounded by said boundary shelter, comprising a plurality of supporting arms each coupling said first surrounding frame with said second surrounding frame, each of said boundary walls having a width slightly smaller than a distance between two adjacent supporting arms, wherein each of said supporting arms is capable of moving between a folded position and an unfolded position, wherein in said folded position, said first surrounding frame is adapted to fold towards said second surrounding frame so as to minimize a depth of said playyard cavity, and in said unfolded position, each of said supporting arms is arranged to substantially support between said first and second surrounding frames and to tensely stretch said boundary shelter, so as to form a tension surface on each of said boundary walls.
 2. A foldable playyard, as recited in claim 1, wherein each of said supporting arms has a retaining end detachably connected to said first surrounding frame and a folding end pivotally connected to said second surrounding arm in such a manner that when each of said supporting arms is pivotally folded to a position that perpendicular to said second surrounding frame, said boundary shelter is tensely pull aside to form said tension on each of said boundary walls.
 3. A foldable playyard, as recited in claim 2, wherein said first surrounding frame comprises two pairs of first surrounding arms connected ends to ends to form a rectangular boundary structure and four coupling joints provided at four corners thereof for detachably connecting with said supporting frame.
 4. A foldable playyard, as recited in claim 3, wherein each of said coupling joints has a tubular sleeve having an opening facing towards said second surrounding frame wherein said retaining end of each of said supporting arms is fittedly inserted into said tubular sleeve, so as to detachably connect said supporting frame with said first surrounding frame.
 5. A foldable playyard, as recited in claim 3, wherein each of said coupling joints has four locking through sleeves, which are transversely provided at four corners of said first surrounding frame respectively, for said retaining ends of said supporting arms fittedly inserting thereinto and comprises four locking members arranged to fittedly insert into said retaining ends of said supporting arms through said locking through sleeves respectively, so as to detachably lock up said supporting frame with said first surrounding frame.
 6. A foldable playyard, as recited in claim 2, wherein said second surrounding frame comprises two pairs of second surrounding arms connected ends to ends to form a rectangular boundary structure that said folding ends of said supporting arms are pivotally connected at four corners thereof respectively, wherein each of said second surrounding arms has a U-shaped cross section to define a receiving cavity in such a manner that each of said supporting arms is adapted to pivotally fold towards said respective second surrounding arm and fittedly received in said receiving cavity thereof.
 7. A foldable playyard, as recited in claim 3, wherein said second surrounding frame comprises two pairs of second surrounding arms connected ends to ends to form a rectangular boundary structure that said folding ends of said supporting arms are pivotally connected at four corners thereof respectively, wherein each of said second surrounding arms has a U-shaped cross section to define a receiving cavity in such a manner that each of said supporting arms is adapted to pivotally fold towards said respective second surrounding arm and fittedly received in said receiving cavity thereof.
 8. A foldable playyard, as recited in claim 4, wherein said second surrounding frame comprises two pairs of second surrounding arms connected ends to ends to form a rectangular boundary structure that said folding ends of said supporting arms are pivotally connected at four corners thereof respectively, wherein each of said second surrounding arms has a U-shaped cross section to define a receiving cavity in such a manner that each of said supporting arms is adapted to pivotally fold towards said respective second surrounding arm and fittedly received in said receiving cavity thereof.
 9. A foldable playyard, as recited in claim 5, wherein said second surrounding frame comprises two pairs of second surrounding arms connected ends to ends to form a rectangular boundary structure that said folding ends of said supporting arms are pivotally connected at four corners thereof respectively, wherein each of said second surrounding arms has a U-shaped cross section to define a receiving cavity in such a manner that each of said supporting arms is adapted to pivotally fold towards said respective second surrounding arm and fittedly received in said receiving cavity thereof.
 10. A foldable playyard, as recited in claim 6, wherein said second surrounding frame comprises two pairs of second surrounding arms connected ends to ends to form a rectangular boundary structure that said folding ends of said supporting arms are pivotally connected at four corners thereof respectively, wherein each of said second surrounding arms has a U-shaped cross section to define a receiving cavity in such a manner that each of said supporting arms is adapted to pivotally fold towards said respective second surrounding arm and fittedly received in said receiving cavity thereof.
 11. A foldable playyard, as recited in claim 1, wherein each of said supporting arms is constructed by a pair of first and second supporting pillars having two outer ends pivotally connected to said first and second surrounding frames respectively and two inner ends pivotally connected with each other in such a manner that each of said supporting arms is adapted to be pivotally folded in half.
 12. A foldable playyard, as recited in claim 11, wherein said supporting frame further comprises a plurality of locking units slidably mounted on said supporting arms respectively for locking up said first supporting pillar with said second supporting pillar in a pivotally movable manner, wherein each of said locking units comprises a tubular locker has an axial slider sleeve which has a diameter slightly larger than a diameter of said respective supporting arm for said first supporting pillar passing through, wherein said slider sleeve has an inner threaded portion arranged to rotatably screw with an outer threaded portion provided on said second supporting pillar so as to securely lock up said first supporting pillar with said second supporting pillar in a pivotally movable manner.
 13. A foldable playyard, as recited in claim 12, wherein each of said first and second surrounding frame comprises two pairs of first and second surrounding arms connected ends to ends to form a rectangular boundary structure respectively wherein each of said first and second surrounding arms has a U-shaped cross section to define a receiving cavity in such a manner that said first and second supporting pillars are capable of pivotally folding into said respective receiving cavities of said first and second surrounding arms respectively.
 14. A foldable playyard, as recited in claim 11, further comprising a plurality of first and second locker members mounted to said first and second surrounding frames for locking said supporting arms with said first and second surrounding frames respectively, wherein each of said first and second surrounding frames has four locking through sleeves transversely provided at four corners thereof respectively, in such a manner that each of said first and second locker members is arranged to fittedly insert into two ends of said respective supporting arm through said locking through sleeves respectively, so as to lock up said supporting arm between said first and second surrounding frames in a pivotally movable manner.
 15. A foldable playyard, as recited in claim 13, further comprising a plurality of first and second locker members mounted to said first and second surrounding frames for locking said supporting arms with said first and second surrounding frames respectively, wherein each of said first and second surrounding frames has four locking through sleeves transversely provided at four corners thereof respectively, in such a manner that each of said first and second locker members is arranged to fittedly insert into two ends of said respective supporting arm through said locking through sleeves respectively, so as to lock up said supporting arm between said first and second surrounding frames in a pivotally movable manner.
 16. A foldable playyard, as recited in claim 1, wherein each of said first and second surrounding frame comprises two pairs of first and second surrounding arms connected ends to ends to form a rectangular boundary structure respectively, wherein each of said supporting arms has a retaining end coupling with said first surrounding frame at a corner thereof and a folding end detachably connected to said second surrounding frame at a corner thereof.
 17. A foldable playyard, as recited in claim 16, wherein said second surrounding frame further comprises four second coupling joints each comprising a locking member firmly attached to said folding end of said respective supporting arm and further having a guiding through slot transversely provided at a corner of said second surrounding frame for said locking member slidably mounted thereto.
 18. A foldable playyard, as recited in claim 17, wherein each of said guiding through slots has an inner inserting portion having a size slightly larger than a size of said locking member and an outer holding portion, having an upper blocking shoulder, integrally extended from said inserting portion in such a manner said locking member is adapted to pass through said inserting portion and slidably move to said holding portion such that said locking member is blocked by said blocking shoulder to lock up said respective supporting arm to said second surrounding frame, so that when the supporting arms are pull outwardly from said inserting portion to said holding portion, said boundary shelter is stretched aside to form said tension surface on each of said boundary walls.
 19. A foldable playyard, as recited in claim 18, wherein said first surrounding frame comprises four first coupling joints provided at four corners thereof, wherein each of said first coupling joints has a tubular sleeve having an opening facing towards said second surrounding frame wherein said retaining end of said respective supporting arms is fittedly inserted into said tubular sleeve, so as to detachably connect said supporting frame with said first surrounding frame.
 20. A foldable playyard, as recited in claim 18, wherein said first surrounding frame comprises four first coupling joints each having a locking through sleeve, which are transversely provided at a corner of said first surrounding frame, for said retaining end of said respective supporting arm fittedly inserting thereinto and a locking member arranged to fittedly insert into said retaining end of said respective supporting arm through said locking through sleeve, so as to detachably lock up said supporting frame with said first surrounding frame. 